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  <head>
    <title>开发中</title>
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  <body>
    该功能正在开发中，敬请期待。。。
    <p><span id="time">3</span>秒后跳转至上一页</p>
    <script>
      var t = setInterval("jump()", 1000);
      var second = 3;
      function jump() {
        second--;
        document.getElementById("time").innerText = second;
        if (second == 0) {
          clearInterval(t);
          window.history.back();
        }
      }
    </script>
  </body>
</html>
